<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
  //typeof 运算符返回一个字符串，表示操作数的类型。
  const a=1
  const b="陶"
  const c=null
  const d=undefined
  const e=10n
  console.log(typeof a)
  console.log(typeof b)
  console.log(typeof c)
  console.log(typeof d)
  console.log(typeof e)
</script>
</body>
</html>